US4055707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective coating for solar panels
Assignee: National Aeronautics and Space Administration
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Filing: 1975-12-22
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Granted: 1977-10-25
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Expires: 1995-12-22
Abstract
Abstract The energy absorbing properties of solar heating panels are improved by depositing a black chrome coating of controlled thickness on a specially prepared surface of a metal substrate. The surface is prepared by depositing a dull nickel on the substrate, and the black chrome is plated on this low emittance surface to a thickness between 0.5 micron and 2.5 microns.
Inventors
- 👤 Glen E. McDonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:23
CPC Classifications
F; F24; F24S; F24S70/00; F24S70/20; F24S70/25; F24S70/225; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y10; Y10S; Y10S126/00; Y10S126/907; Y10S126/908; Y10S205/00; Y10S205/923; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854; Y10T428/12861; Y10T428/12937
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
In apparatus for collecting solar energy of the type having a composite heating panel for absorbing said solar energy and converting the same to heat, the improvement comprising a metallic substrate forming a high conductivity base for said panel, said substrate having at least one surface exposed to said solar energy, a layer of dull nickel on said one surface to lower the emissivity of said surface, and a coating of black chrome on said layer of dull nickel, said coating having a thickness between about 0.5 micron and about 2.5 microns and being highly absorbtive in the visible range.
Claim 2
Dependent Claim
100 words
In apparatus for collecting solar energy of the type having a composite heating panel for absorbing said solar energy and converting the same to heat, the improvement comprising a metallic substrate forming a high conductivity base for said panel, said substrate having at least one surface exposed to said solar energy, a layer of dull nickel on said one surface to lower the emissivity of said surface, and a coating of black chrome on said layer of dull nickel, said coating having a thickness between about 0.5 micron and about 2.5 microns and being highly absorbtive in the visible range.
Claim 3
Dependent Claim
11 words
Apparatus as claimed in claim 1 wherein the substrate is steel.
Claim 4
Dependent Claim
11 words
Apparatus as claimed in claim 1 wherein the substrate is aluminum.
Claim 5
Dependent Claim
19 words
Apparatus as claimed in claim 1 wherein the layer of dull nickel has a thickness of about 0.0005 inch.
Claim 6
Independent Claim
75 words
A method of making a composite heating panel for a solar collector comprising the steps of depositing a layer of dull nickel to a thickness of about 0.0005 inch on a surface of a high thermal conductivity substrate to lower the emissivity thereof, and coating said layer of dull nickel with black chrome to a thickness between about 0.5 micron and about 2.5 microns to raise the absorbtivity of said surface in the visible range.
Claim 7
Independent Claim
75 words
A method of making a composite heating panel for a solar collector comprising the steps of depositing a layer of dull nickel to a thickness of about 0.0005 inch on a surface of a high thermal conductivity substrate to lower the emissivity thereof, and coating said layer of dull nickel with black chrome to a thickness between about 0.5 micron and about 2.5 microns to raise the absorbtivity of said surface in the visible range.
Claim 8
Dependent Claim
21 words
A method of making a composite heating panel as claimed in claim 5 wherein the surface of the substrate is roughened.
Claim 9
Dependent Claim
22 words
A method of making a composite heating panel as claimed in claim 6 wherein the substrate surface is roughened by physical abrasion.
Claim 10
Dependent Claim
31 words
A method of making a composite heating panel as claimed in claim 7 wherein the substrate surface is grit blasted to a roughness of between about 0.75 μm and about 25μm.
References Cited (Backward Citations)
US2917817A
Cited
US3920413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |